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Use of Viton in sour service

Use of Viton in sour service

Use of Viton in sour service

(OP)
Hello,
I have found conflicting information regarding the use of Viton in sour service.  Does anyone have experience with Viton in sour service and is there a H2S limit for Viton?
Thanks!

RE: Use of Viton in sour service

You need to specify the grade of viton (a,b,c,d I think) and they don't all work.  One is excellent in sour service.

RE: Use of Viton in sour service

Jason,

As the previous resonder aluded to, there are now several different types/grades of Viton, so you need to be very specific when specifying elastomers using this tradename.  Traditional vinylidene fluoride-based fluorelastomers (ASTM D 1418 designation of FKM) are not suitable for sour conditions.  Many of the Viton grades are FKM elastomers.  Newer formulations like VTR-8802 are copolymers of tetrafluoroethylene and propylene, called either TFE/P or FEPM which is the ASTM D 1418 designation.  This type of fluoroelastomer is suitable for sour service.  The other type of elastomer that has good resistance to H2S is called perfluoroelastomer (FFKM designation).  Kalrez is the DuPont tradename for these materials.  Go to the DuPont Elastomers website for more info:

http://www.dupontelastomers.com/

RE: Use of Viton in sour service

Don't just rely on the elastomer manufacturer's compatibility charts.  Get any recommendations backed up with NORSOK M-701 test reports for both sour ageing and rapid gas decompression resistance ensuring that the data is commensurate with your proposed design conditions.

Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdoweb/

RE: Use of Viton in sour service

(OP)
Thank you very much everyone for your valuable responses.  I really appreciate this information!

RE: Use of Viton in sour service

this is the NACE standard for evaluation of elastomeric materials in sour service:

NACE TM0187-2003 Evaluating elastomeric materials in sour gas environments

these reports from HSE can give you some good advise:

Elastomers for fluid containment in offshore oil
and gas production: Guidelines and review
http://www.hse.gov.uk/research/rrpdf/rr320.pdf

Elastomeric seals for rapid gas decompression applications in high-pressure services
http://www.hse.gov.uk/research/rrpdf/rr485.pdf

Try also these corrosion guides:
http://www.corrosionist.com/isocorrosion_curves.htm
http://www.controlandpower.com/catalog/Software/AshcroftCorrosionGuide.zip


hope this help

S

Metal Corrosion
 

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